Derivative Financial Instruments - Effect of Master Netting Arrangements on Derivative Assets and Liabilities in the Consolidated Statements of Condition (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Interest Rate Swaps, Gross Amount of Recognized Assets	$ 7,393	$ 1,319
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition	0	0
Interest Rate Swaps, Net Amount of Assets Presented in the Statement of Condition	7,393	1,319
Interest Rate Swaps, Financial Instruments	0	0
Interest Rate Swaps, Cash Collateral Received	0
Interest Rate Swaps, Net Amount	7,393	1,319
Interest Rate Swaps, Gross Amount of Recognized Liabilities	33,196	60,987
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition	0
Interest Rate Swaps, Net Amount of Liabilities Presented in the Statement of Condition	33,196	60,987
Interest Rate Swaps, Financial Instruments	0	99
Interest Rate Swaps, Cash Collateral Received	29,067	63,517
Interest Rate Swaps, Net Amount	$ 4,129	(2,629)
Interest Rate Swaps, Gross Amount Offset in the Statement of Condition		$ 0